Direction of Propeller Shaft?? (1 Viewer)

[fj40cm1980]

Hi all -- Happy Veteran's Day and thank you to all those that have served.

I think I've read the propeller shaft can connect to the front axel OR the tranny --- and most trucks that I've seen online (1980 or similar) show the propeller shaft connecting to the front axel and the sleeve/yoke connecting to the tranny. HOWEVER, the FSM clearly shows a diagram that has the sleeve/yoke positioned towards the front of the truck. What's the consensus on this?

 

[charliemeyer007]

I think the slip yoke provides the clearance for the belly pan/skid plate.

 

[Engineer8000]

I read where the slip yokes connect to the TC for better protection. I have the 4 speed skid plate and it clears the upper u-joint/yoke ok. I have 3 speed flanges on the diffs and a 4 speed so am running the 4 speed drive shafts backwards with 3 speed slip yokes. You see it different ways on different makes/models.

 

[Broski]

In general it can be run ether way.
On a 80 series the OEM configuration is slip/sleeve yoke front slip yoke at the diff, rear slip yoke at the transfer case.

 

[pb4ugo]

I prefer to keep the slip yokes out of the debris and trail rash if possible. So I like to install them at the tcase.

 

[Engineer8000]

That was one of the examples I saw when I was trying to figure this out.

 

[peesalot]

IMO, swap your end yokes with a little u-joint work & run the slips at tcase.
They may not be the same u-joint now that I think about it..

 

[franklin40]

my drive line guy built mine so that the make end of the slip joint was pointing up to keep water and dirt from getting in even though he knew it came the other way. he said it didn’t really matter functionally so his philosophy was to try and keep water and dirt from “running into the slip joint”. again more philosophy than physics

 

[65swb45]

My ‘logic’ such as it is, for running the slip yoke at the transfer case has less to do with the debris concern and more to do with axle wrap. I think it’s better to have the slip spline away from the diffs, as it puts less lateral stress on the splines.

When everything is new, it might not make much difference. But if you can push up and down on the shaft at the slipyoke and feel lateral movement, try and imagine the additional force that the axle wrap would apply if the slipyoke was at the diff end.

Mark

wwwmarksoffroad.net

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[Broski]

Mark
wwwmarksoffroad.net

If you think this post is useful, please consider hitting the like button.

This is Mud not YouTube

38544 reactions not enough for you or do vendors get paid for likes ?

Cheers

 

[Broski]

Axle wrap is only an issue at the rear axle so running the yoke at the axle in the front should not be a concern.
Newer Cruisers are linked and don’t have axle wrap so there’s that.
IMO you wouldn’t want to run the Yoke at the axle in the back because it’s too easy to damage it on rocks or dropping off a ledge.

 

[Mark W]

In my experience it makes no difference in a 'early Cruiser. Original configuration is slip joint at the T/C end of the shaft. I have heard, and made, the argument that putting the slip joint at the axle end of the driveshaft will theoretically encourage any water to drain. But with appropriate grease in the slip joint and the original felt wiper seal in place that is really reaching.

I have a vauge thought in the back of my head that maybe there would be more wear on the slip joint when it is at the lower end of the driveshaft. But I can not pin down the reasoning, can not quantify it and even if that subconscious niggle is right, I do not think it could be significant.

Mark...

 

[Engineer8000]

Mark you may be correct on the axle wrap stresses. I don't think my 3fe with open diffs will be wrapping any axles.

 

[3_puppies]

IIRC the 81-84 60 series front shaft had the slip yoke at the axle end in stock form with the multi ujoint end at the tranfer

 

[65swb45]

IIRC the 81-84 60 series front shaft had the slip yoke at the axle end in stock form with the multi ujoint end at the tranfer

That is a good point Paul.

 

[Mark W]

IIRC the 81-84 60 series front shaft had the slip yoke at the axle end in stock form with the multi ujoint end at the tranfer

Yep, the rigs with double cardens, all had the single joint at the axle end of course. I don't think I have ever seen a double carden combined with a slip joint at the same end of the driveshaft.

Mark...